Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b3897f0479e3ae…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 14:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85d007a6dad4e8d3f7ea545d8a74230a SHA-1: d8f5cd55b9f7d8857d4e740828e4ef2609d4bf67 SHA-256: 22b3897f0479e3ae17b2541206d2ac8102f36352108457b81b059cef496f1ba8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely to facilitate the download of malware. While no scripts were directly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://electriccityusa.com/images/fck_uploads/file/jabenenutum.pdf
    • https://vieclamlaocai.vn/webroot/img/files/sovezopuralodufozobidex.pdf
    • http://sinoscaform.com/upload/ckimg/files/202109111338208130.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/pejajiroveruneloriridimil.pdf
    • http://monikaknoblochova.com/userfiles/file/56965915132.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1c02300468e6460332db00549c733978/4117332271.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/db27d431f518d7e152f4619524a7cce1/lexudirana.pdf
    • https://bushregenerators.net/userfiles/files/45093348758.pdf
    • http://se-ty.com/uploads/userfiles/file/lubaxofimi.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/zovajuzebiseramamamezuko.pdf
    • https://tkbhanna.com/ckfinder/userfiles/files/9836181086.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/tekulive.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4657917411.pdf
    • http://softwarefactory.nl/images/file/xalonofifobija.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/93116918138.pdf
    • https://ivanamihic.com/files/pirad.pdf
    • http://leylatoprak.com/userfiles/file/61867457659.pdf
    • http://quaint-house.com/images/blog/file/77668597810.pdf
    • http://tsnpharma.com/upload/files/39984260220.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210907200331.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf96805af---boxawomevurem.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9f1d8770---52816228012.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e3e4c82cf0c9c8c082bb04ab71ff1a44/fijutolubu.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/52918541518.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a6a2654ac73d948ef77d58d5322dce23/1965307813.pdf
    • http://thankschicken.com/uploads/files/pidefuv.pdf
    • http://forumcutuca.com/ckfinder/userfiles/files/43745672996.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gta+5+apk+download+game
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 16792 bytes
font_01_sfnt_off0000ff04.bin
c870e180cf9b08741c96d7470fe829aca314970d44976937e1cf784ff4841fae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 10728 bytes
font_02_sfnt_off00011793.bin
18b2cad927d852231c535e6d44fb55af9e9e7f45143a52a419adb7536b0df1b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 18400 bytes